JP2003286002A - Carbon monoxide removing apparatus - Google Patents

Carbon monoxide removing apparatus

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Publication number
JP2003286002A
JP2003286002A JP2002088058A JP2002088058A JP2003286002A JP 2003286002 A JP2003286002 A JP 2003286002A JP 2002088058 A JP2002088058 A JP 2002088058A JP 2002088058 A JP2002088058 A JP 2002088058A JP 2003286002 A JP2003286002 A JP 2003286002A
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JP
Japan
Prior art keywords
carbon monoxide
selective oxidation
temperature
concentration
reformed gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2002088058A
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Japanese (ja)
Other versions
JP3722079B2 (en
Inventor
Yasuhiro Taniguchi
育宏 谷口
Hiroaki Hashigaya
浩昭 橋ヶ谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP2002088058A priority Critical patent/JP3722079B2/en
Priority to EP03002918A priority patent/EP1369382A3/en
Priority to US10/367,755 priority patent/US7189373B2/en
Publication of JP2003286002A publication Critical patent/JP2003286002A/en
Application granted granted Critical
Publication of JP3722079B2 publication Critical patent/JP3722079B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • H01M8/0612—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants from carbon-containing material
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a carbon monoxide removing apparatus in which the degradation of a catalyst is prevented. <P>SOLUTION: The carbon monoxide removing apparatus having a plurality of carbon monoxide selectively oxidizing means mounted in series to reduce the concentration of carbon monoxide in a reformed gas by selectively oxidizing carbon monoxide contained in the reformed gas is provided with temperature detecting means 9, 10 for detecting the catalyst temperature of each of respective carbon monoxide selectively oxidizing means 3B, 3C and an air controlling means 5 for controlling the quantity of air supplied to each of carbon monoxide selectively oxidizing means corresponding to the detected catalyst temperature. <P>COPYRIGHT: (C)2004,JPO

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、改質ガス中に含ま
れる一酸化炭素を除去する一酸化炭素除去装置に関す
る。TECHNICAL FIELD The present invention relates to a carbon monoxide removing apparatus for removing carbon monoxide contained in a reformed gas.

【０００２】[0002]

【従来の技術】従来、一酸化炭素選択酸化法を用いて、
改質器から出力される改質ガス中に含まれる一酸化炭素
（ＣＯ）の濃度を低減する一酸化炭素選択酸化部を備え
た燃料電池システムが知られている。倒えば、特開平８
−３２９９６９号公報で開示されている燃料電池システ
ムには、改質ガス中のＣＯ濃度が上昇すると、一酸化炭
素選択酸化部に供給する空気量を増加させて、ＣＯ濃度
を低減させる技術が開示されている。2. Description of the Related Art Conventionally, by using a carbon monoxide selective oxidation method,
A fuel cell system including a carbon monoxide selective oxidation unit that reduces the concentration of carbon monoxide (CO) contained in a reformed gas output from a reformer is known. If collapsed
The fuel cell system disclosed in Japanese Patent No. 329969 discloses a technique of increasing the amount of air supplied to the carbon monoxide selective oxidation unit to reduce the CO concentration when the CO concentration in the reformed gas rises. Has been done.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、このよ
うな従来の発明にあっては、一酸化炭素選択酸化部の空
気量を増加させることによって選択酸化反応による発熱
量が増加し、一酸化炭素選択酸化部の温度が触媒の反応
温度以上にまで上昇して触媒が劣化する可能性があると
いう問題があった。However, in such a conventional invention, the amount of heat generated by the selective oxidation reaction is increased by increasing the amount of air in the carbon monoxide selective oxidation section, and the carbon monoxide selective oxidation is performed. There is a problem that the temperature of the oxidation part may rise to the reaction temperature of the catalyst or higher and the catalyst may deteriorate.

【０００４】また、特開平８−３２９９６９号公報には
ガスの流れ方向に多段に設けられた一酸化炭素選択酸化
触媒層の各段の温度を冷媒によって調整する技術が開示
されているが、冷媒だけで温度を調整するには限界があ
る。Further, Japanese Patent Laid-Open No. 8-329969 discloses a technique of adjusting the temperature of each stage of a carbon monoxide selective oxidation catalyst layer provided in multiple stages in the gas flow direction with a refrigerant. There is a limit to adjusting the temperature alone.

【０００５】本発明は、上述の問題点に鑑みてなされた
ものであり、多段に設けられた一酸化炭素選択酸化部の
各空気量を各温度に応じて調整することによって、一酸
化炭素選択酸化部の過剰な温度上昇を防止しつつ改質ガ
ス中のＣＯ濃度を低減させることができる一酸化炭素除
去装置を提供することを目的とする。The present invention has been made in view of the above-mentioned problems, and carbon monoxide selection is performed by adjusting the amount of each air in the carbon monoxide selective oxidation section provided in multiple stages according to each temperature. An object of the present invention is to provide a carbon monoxide removing device capable of reducing the CO concentration in the reformed gas while preventing an excessive temperature rise in the oxidation part.

【０００６】[0006]

【課題を解決するための手段】第１の発明は、改質ガス
に含まれる一酸化炭素を選択的に酸化することにより、
改質ガス中の一酸化炭素濃度を低減する一酸化炭素選択
酸化手段を複数個、直列に設置する一酸化炭素除去装置
において、それぞれの一酸化炭素選択酸化手段の触媒温
度を検出する温度検出手段と、前記検出された触媒温度
に応じて、各一酸化炭素選択酸化手段に供給する空気量
を調整する空気量調整手段とを備える。A first aspect of the invention is to selectively oxidize carbon monoxide contained in a reformed gas,
In a carbon monoxide removing apparatus in which a plurality of carbon monoxide selective oxidizing means for reducing the carbon monoxide concentration in the reformed gas are installed in series, a temperature detecting means for detecting the catalyst temperature of each carbon monoxide selective oxidizing means. And an air amount adjusting means for adjusting the amount of air supplied to each carbon monoxide selective oxidizing means in accordance with the detected catalyst temperature.

【０００７】第２の発明は、第１の発明において、前記
空気量調整手段は、触媒温度が所定温度よりも低い一酸
化炭素選択酸化手段への空気量を増量し、触媒温度が所
定温度よりも高い一酸化炭素選択酸化手段への空気量を
減量する。In a second aspect based on the first aspect, the air amount adjusting means increases the air amount to the carbon monoxide selective oxidizing means whose catalyst temperature is lower than a predetermined temperature, and the catalyst temperature is lower than the predetermined temperature. Also reduces the amount of air to the carbon monoxide selective oxidation means.

【０００８】第３の発明は、第１の発明において、前記
空気量調整手段は、それぞれの一酸化炭素選択酸化手段
における触媒温度と触媒の活性上限温度との差を算出
し、活性上限温度までの温度差が大きい一酸化炭素選択
酸化手段の空気量を増量し、活性上限温度までの温度差
が小さい一酸化炭素選択酸化手段の空気量を減量する。In a third aspect based on the first aspect, the air amount adjusting means calculates a difference between the catalyst temperature and the catalyst upper limit temperature in each of the carbon monoxide selective oxidizing means, up to the activity upper limit temperature. The amount of air in the carbon monoxide selective oxidation means having a large temperature difference is increased, and the amount of air in the carbon monoxide selective oxidation means having a small temperature difference up to the activation upper limit temperature is decreased.

【０００９】第４の発明は、第１の発明において、前記
空気量調整手段は、それぞれの一酸化炭素選択酸化手段
における触媒温度と触媒の活性上限温度との温度差に応
じてそれぞれの一酸化炭素選択酸化手段での選択酸化処
理する分担の比率を算出し、この比率に基づいてそれぞ
れの一酸化炭素選択酸化手段の空気量を調整する。According to a fourth aspect of the present invention, in the first aspect of the present invention, the air amount adjusting means is configured so that each of the carbon monoxide selective oxidizing means has a corresponding monoxide in accordance with a temperature difference between the catalyst temperature and the catalyst upper limit temperature. The share of the selective oxidation treatment in the carbon selective oxidation means is calculated, and the air amount of each carbon monoxide selective oxidation means is adjusted based on this ratio.

【００１０】第５の発明は、第１から第４のいずれか一
つの発明において、最上流に位置する一酸化炭素選択酸
化手段に流入する改質ガス中の一酸化炭素濃度を検出す
る手段を設け、前記空気量調整手段は、検出された改質
ガスの一酸化炭素濃度が所定濃度範囲にない場合に、改
質ガス中の一酸化炭素濃度が所定濃度範囲に入るよう
に、流入する改質ガス中の一酸化炭素濃度とそれぞれの
一酸化炭素選択酸化手段の触媒温度に応じて各一酸化炭
素選択酸化手段への供給空気量を調整する。In a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, a means for detecting the carbon monoxide concentration in the reformed gas flowing into the carbon monoxide selective oxidation means located at the uppermost stream is provided. If the detected carbon monoxide concentration of the reformed gas is not within the predetermined concentration range, the air amount adjusting means is provided so that the carbon monoxide concentration in the reformed gas is within the predetermined concentration range. The amount of air supplied to each carbon monoxide selective oxidation means is adjusted according to the carbon monoxide concentration in the quality gas and the catalyst temperature of each carbon monoxide selective oxidation means.

【００１１】第６の発明は、第１から第４のいずれか一
つの発明において、最下流に位置する一酸化炭素選択酸
化手段から排出される改質ガス中の一酸化炭素濃度を検
出する手段を設け、前記空気量調整手段は、検出された
改質ガス中の一酸化炭素濃度が所定濃度範囲にない場合
に、改質ガス中の一酸化炭素濃度が所定濃度範囲に入る
ように、それぞれの一酸化炭素選択酸化手段の触媒温度
に応じて各一酸化炭素選択酸化手段への供給空気量を調
整する。A sixth aspect of the present invention is the means for detecting the carbon monoxide concentration in the reformed gas discharged from the carbon monoxide selective oxidizing means located at the most downstream side in any one of the first to fourth aspects. The air amount adjusting means, when the detected carbon monoxide concentration in the reformed gas is not within the predetermined concentration range, so that the carbon monoxide concentration in the reformed gas falls within the predetermined concentration range, respectively. The amount of air supplied to each carbon monoxide selective oxidation means is adjusted according to the catalyst temperature of the carbon monoxide selective oxidation means.

【００１２】第７の発明は、第１から第４のいずれか一
つの発明において、最上流に位置する一酸化炭素選択酸
化手段に流入する改質ガスの流量を検出する手段を設
け、前記空気量調整手段は、検出された改質ガスの流量
が変化したときに、一酸化炭素選択酸化手段に流入する
空気量をそれぞれの一酸化炭素選択酸化手段の触媒温度
に応じて調整する。A seventh aspect of the invention is the fuel cell system according to any one of the first to fourth aspects of the invention, further comprising means for detecting the flow rate of the reformed gas flowing into the carbon monoxide selective oxidation means located at the uppermost stream, The amount adjusting unit adjusts the amount of air flowing into the carbon monoxide selective oxidizing unit according to the catalyst temperature of each carbon monoxide selective oxidizing unit when the detected flow rate of the reformed gas changes.

【００１３】[0013]

【発明の効果】請求項１の発明によれば、それぞれ直列
に配置された一酸化炭素選択酸化手段の触媒温度を検出
し、前記検出された触媒温度に応じて、それぞれの一酸
化炭素選択酸化手段に供給する空気量を調整するように
した。According to the first aspect of the present invention, the catalyst temperature of the carbon monoxide selective oxidation means arranged in series is detected, and the carbon monoxide selective oxidation is detected according to the detected catalyst temperature. The amount of air supplied to the means was adjusted.

【００１４】そのため、各一酸化炭素選択酸化手段の触
媒温度に応じて供給する空気量を制御するため、触媒温
度が反応温度以上に上昇することがなく、触媒の劣化を
防止し、触媒温度を制御しながら効率よく一酸化炭素を
除去することができる。Therefore, since the amount of air to be supplied is controlled according to the catalyst temperature of each carbon monoxide selective oxidation means, the catalyst temperature does not rise above the reaction temperature, the catalyst deterioration is prevented, and the catalyst temperature is controlled. It is possible to remove carbon monoxide efficiently while controlling.

【００１５】請求項２の発明によれば、空気量を増量す
る場合にはそれぞれの一酸化炭素選択酸化手段における
触媒温度が所定温度よりも低い一酸化炭素選択酸化手段
の空気量を増やし、空気量を減量する場合にはそれぞれ
の一酸化炭素選択酸化手段における触媒温度が所定温度
よりも高い一酸化炭素選択酸化手段の空気量を減らす構
成とした。According to the second aspect of the invention, when the amount of air is increased, the amount of air in the carbon monoxide selective oxidation means whose catalyst temperature in each carbon monoxide selective oxidation means is lower than a predetermined temperature is increased, When the amount is reduced, the amount of air in the carbon monoxide selective oxidation means in which the catalyst temperature in each carbon monoxide selective oxidation means is higher than a predetermined temperature is reduced.

【００１６】空気量を増加させると一酸化炭素の選択酸
化反応によって一酸化炭素を除去することができる反
面、選択酸化反応の発熱により酸化部の温度が上昇す
る。When the amount of air is increased, the carbon monoxide can be removed by the selective oxidation reaction of carbon monoxide, but the heat of the selective oxidation reaction raises the temperature of the oxidation part.

【００１７】本発明によれば、一酸化炭素選択酸化手段
の触媒の温度が反応する活性温度よりも低温であるとき
に一酸化炭素選択酸化手段への空気量を増加して、触媒
の温度を上昇させ、一方、一酸化炭素選択酸化手段の触
媒の温度が活性温度よりも高温であるときには一酸化炭
素選択酸化手段の空気量を減少して、触媒温度を低下さ
せるため、一酸化炭素選択酸化手段の温度を触媒が反応
する活性温度に維持することができ、温度過上昇による
触媒の劣化を防止しつつ、改質ガスの一酸化炭素濃度を
効率よく低減することができる。According to the present invention, when the temperature of the catalyst of the carbon monoxide selective oxidation means is lower than the reaction activation temperature, the amount of air to the carbon monoxide selective oxidation means is increased to increase the temperature of the catalyst. On the other hand, when the temperature of the catalyst of the carbon monoxide selective oxidation means is higher than the activation temperature, the amount of air in the carbon monoxide selective oxidation means is decreased to lower the catalyst temperature. The temperature of the means can be maintained at the activation temperature at which the catalyst reacts, and the carbon monoxide concentration of the reformed gas can be efficiently reduced while preventing the catalyst from deteriorating due to excessive temperature rise.

【００１８】請求項３の発明によれば、それぞれの一酸
化炭素選択酸化手段における触媒温度と触媒の活性上限
温度との差を算出し、活性上限温度までの温度差が大き
い一酸化炭素選択酸化部の空気量を増やし、活性上限温
度までの温度差が小さい一酸化炭素選択酸化手段の空気
量を減らす構成とした。According to the third aspect of the present invention, the difference between the catalyst temperature in each of the carbon monoxide selective oxidation means and the catalyst upper limit temperature is calculated, and the carbon monoxide selective oxidation having a large temperature difference up to the activity upper limit temperature. The amount of air in the part is increased and the amount of air in the carbon monoxide selective oxidation means having a small temperature difference up to the activation upper limit temperature is reduced.

【００１９】本発明によれば、触媒が反応する活性上限
温度に対してまだ温度上昇に余裕のある一酸化炭素選択
酸化手段の空気量を増加させ、余裕のない一酸化炭素選
択酸化手段の空気量を減少させるため、請求項２の発明
よりもさらに温度過上昇による触媒の劣化を防止できる
という効果が得られる。According to the present invention, the amount of air in the carbon monoxide selective oxidation means which has a margin of temperature rise with respect to the activity upper limit temperature at which the catalyst reacts is increased, and the air of the carbon monoxide selective oxidation means having no margin increases. Since the amount is reduced, it is possible to obtain the effect that the deterioration of the catalyst due to the excessive temperature rise can be prevented more than the invention of claim 2.

【００２０】請求項４の発明によれば、それぞれの一酸
化炭素選択酸化手段における触媒の活性上限温度までの
温度差に応じてそれぞれの一酸化炭素選択酸化手段での
選択酸化処理する分担の比率を決め、この比率に基づい
てそれぞれの一酸化炭素選択酸化部の空気量を調整する
構成とした。According to the invention of claim 4, the proportion of the allocation of the selective oxidation treatment in each carbon monoxide selective oxidation means according to the temperature difference up to the activity upper limit temperature of the catalyst in each carbon monoxide selective oxidation means. Was determined, and the amount of air in each carbon monoxide selective oxidation part was adjusted based on this ratio.

【００２１】したがって、請求項３の発明では特定の一
酸化炭素選択酸化手段の空気量を増加させるのに対し
て、請求項４の発明では各一酸化炭素選択酸化手段の空
気量を各部の温度に応じた比率で増加させるため、請求
項３の温度過上昇による触媒の劣化を防止できるという
効果に加えて、活性上限温度に達してない一酸化炭素選
択酸化手段全てを有効に利用することができ、効果的に
改質ガスの一酸化炭素濃度を低減することができるとい
う効果が得られる。Therefore, in the invention of claim 3, the air amount of the specific carbon monoxide selective oxidation means is increased, whereas in the invention of claim 4, the air amount of each carbon monoxide selective oxidation means is changed to the temperature of each part. Therefore, in addition to the effect of preventing deterioration of the catalyst due to excessive temperature rise of claim 3, all of the carbon monoxide selective oxidation means that have not reached the activation upper limit temperature can be effectively used. Therefore, it is possible to effectively reduce the carbon monoxide concentration of the reformed gas.

【００２２】請求項５の発明によれば、最上流の一酸化
炭素選択酸化手段に流入する改質ガスの一酸化炭素濃度
が所定濃度範囲にない場合に、改質ガス中の一酸化炭素
濃度が所定濃度範囲に入るように流入する改質ガス中の
一酸化炭素濃度とそれぞれの一酸化炭素選択酸化手段の
触媒温度に応じて各一酸化炭素選択酸化手段への供給空
気量を調整する構成とした。According to the fifth aspect of the present invention, when the carbon monoxide concentration of the reformed gas flowing into the most upstream carbon monoxide selective oxidation means is not within the predetermined concentration range, the carbon monoxide concentration in the reformed gas. That adjusts the amount of air supplied to each carbon monoxide selective oxidation means according to the concentration of carbon monoxide in the reformed gas and the catalyst temperature of each carbon monoxide selective oxidation means such that And

【００２３】空気量は流入する改質ガスの一酸化炭素濃
度に基づいて、濃度が所定範囲よりも高いときは空気量
を増加、濃度が低いときは空気量を減少するように調整
されるため、流入改質ガスの濃度変化に対して改質ガス
中の一酸化炭素を所定濃度まで低減させることができ
る。The amount of air is adjusted based on the concentration of carbon monoxide flowing into the reformed gas so as to increase the amount of air when the concentration is higher than a predetermined range and decrease the amount of air when the concentration is low. The carbon monoxide in the reformed gas can be reduced to a predetermined concentration with respect to the change in the concentration of the inflowing reformed gas.

【００２４】請求項６の発明によれば、最下流の一酸化
炭素選択酸化手段から排出される改質ガス中の一酸化炭
素濃度が所定濃度範囲にない場合に、改質ガス中の一酸
化炭素濃度が所定濃度範囲に入るように各一酸化炭素選
択酸化手段への供給空気量をそれぞれの一酸化炭素選択
酸化手段の触媒温度に応じて調整する構成とした。According to the invention of claim 6, when the carbon monoxide concentration in the reformed gas discharged from the most downstream carbon monoxide selective oxidation means is not within the predetermined concentration range, the monoxide in the reformed gas is The amount of air supplied to each carbon monoxide selective oxidation means is adjusted according to the catalyst temperature of each carbon monoxide selective oxidation means so that the carbon concentration falls within a predetermined concentration range.

【００２５】一酸化炭素選択酸化手段に所定の空気量が
供給されても、温度変化や触媒の劣化などによって一酸
化炭素選択酸化手段から排出される改質ガス中の一酸化
炭素濃度がばらつくこともある。請求項６の発明によれ
ば改質ガス中の一酸化炭素濃度を検出して空気量を調整
するので、改質ガス中の一酸化炭素濃度がばらついたと
きにも一酸化炭素濃度を確実に低減させることが可能で
ある。Even if a predetermined amount of air is supplied to the carbon monoxide selective oxidation means, the carbon monoxide concentration in the reformed gas discharged from the carbon monoxide selective oxidation means varies due to temperature changes and catalyst deterioration. There is also. According to the invention of claim 6, since the carbon monoxide concentration in the reformed gas is detected and the air amount is adjusted, the carbon monoxide concentration can be reliably ensured even when the carbon monoxide concentration in the reformed gas varies. It is possible to reduce.

【００２６】請求項７の発明によれば、最上流の一酸化
炭素選択酸化手段に流入する改質ガスの流量が変化した
ときに、一酸化炭素選択酸化手段に流入する空気量をそ
れぞれの一酸化炭素選択酸化手段の触媒温度に応じて調
整する構成とした。According to the invention of claim 7, when the flow rate of the reformed gas flowing into the most upstream carbon monoxide selective oxidizing means changes, the amount of air flowing into the carbon monoxide selective oxidizing means is changed to one. The configuration was adjusted according to the catalyst temperature of the carbon oxide selective oxidation means.

【００２７】流入する改質ガスの流量が変化すると、一
酸化炭素を酸化させるために必要な空気量も変化する。
流量が増加したときは空気量が増加、流量が減少したと
きは空気量が減少するように調整することによって、流
入する改質ガスの流量変化に応じて改質ガス中の一酸化
炭素を所定濃度まで低減させることができる。When the flow rate of the reformed gas that flows in changes, the amount of air required to oxidize carbon monoxide also changes.
By adjusting the amount of air to increase when the flow rate increases and decrease the amount of air when the flow rate decreases, a predetermined amount of carbon monoxide in the reformed gas is set according to the change in the flow rate of the reformed gas that flows in. It can be reduced to the concentration.

【００２８】[0028]

【発明の実施の形態】図１は、本発明の第１の実施形態
を示す構成図である。改質器３は改質部３Ａ、第１選択
酸化部３Ｂ、第２選択酸化部３Ｃからなる。改質部３Ａ
には、燃料タンク１から燃料ガスが供給されるととも
に、水タンク２から水が供給される。燃料ガスとして
は、例えばメタノールが用いられる。この場合、改質部
３Ａでは以下の化学反応によって改質ガスが生成され
る。1 is a block diagram showing a first embodiment of the present invention. The reformer 3 includes a reforming section 3A, a first selective oxidation section 3B, and a second selective oxidation section 3C. Reforming section 3A
The fuel gas is supplied from the fuel tank 1 and the water is supplied from the water tank 2. For example, methanol is used as the fuel gas. In this case, in the reforming section 3A, reformed gas is generated by the following chemical reaction.

【００２９】 ＣＨ3ＯＨ＋Ｈ2Ｏ→ＣＯ2＋３Ｈ2 （１） ＣＨ3ＯＨ→ＣＯ＋２Ｈ2 （２） すなわち（１）式の水蒸気改質反応、（２）式のメタノ
ール分解反応によって改質ガスが生成される。CH 3 OH + H 2 O → CO 2 + 3H 2 (1) CH 3 OH → CO + 2H 2 (2) That is, reformed gas is generated by the steam reforming reaction of the formula (1) and the methanol decomposition reaction of the formula (2). To be done.

【００３０】改質ガスの組成は主に水素であるが、一酸
化炭素（以下、ＣＯと示す）が含まれる。このＣＯが燃
料電池４に供給されると発電効率の低下を招くため、こ
の一酸化炭素は第１選択酸化部３Ｂと第２選択酸化部３
Ｃによって酸化され、除去される。第１選択酸化部３Ｂ
と第２選択酸化部３Ｃにおける選択酸化反応は以下のと
おりである。The composition of the reformed gas is mainly hydrogen, but contains carbon monoxide (hereinafter referred to as CO). When this CO is supplied to the fuel cell 4, it causes a decrease in power generation efficiency. Therefore, the carbon monoxide is contained in the first selective oxidation part 3B and the second selective oxidation part 3B.
It is oxidized by C and removed. First selective oxidation part 3B
The selective oxidation reaction in the second selective oxidation section 3C is as follows.

【００３１】 Ｃ〇＋（１／２）Ｏ2→ＣＯ2 （３） （３）式の反応によって、第１選択酸化部３Ｂでは改質
ガス中のＣＯ濃度を数％から１０００ｐｐｍ程度に、第
２選択酸化部３Ｃでは１０００ｐｐｍ程度から２０ｐｐ
ｍ以下に低減できる。By the reaction of C∘ + (1/2) O 2 → CO 2 (3) (3), the CO concentration in the reformed gas in the first selective oxidation section 3B is changed from several% to about 1000 ppm, 2 In the selective oxidation section 3C, about 1000 ppm to 20 pp
It can be reduced to m or less.

【００３２】第１、第２選択酸化部で所定濃度までＣＯ
を低減した改質ガスは、燃料電池４へ供給される。ま
た、空気がポンプ６Ｂによって燃料電池４のアノードに
供給される。燃料電池４のアノードには改質ガス、すな
わち水素リッチガスが供給され、カソードには空気が供
給される。その結果、アノードとカソードのそれぞれに
おいて以下に示す電極反応が進行する。CO in the first and second selective oxidation sections up to a predetermined concentration
The reformed gas with reduced gas is supplied to the fuel cell 4. Further, air is supplied to the anode of the fuel cell 4 by the pump 6B. A reforming gas, that is, a hydrogen-rich gas is supplied to the anode of the fuel cell 4, and air is supplied to the cathode. As a result, the following electrode reactions proceed in each of the anode and the cathode.

【００３３】 アノード（水素極）：Ｈ2→２Ｈ+＋２ｅ- （４） カソード（酸素極）：２Ｈ+＋２ｅ-＋（１／２）Ｏ2→Ｈ2Ｏ （５） 燃料電池４は、上記電極反応によって得られる起電力に
より図示しないモータを駆動することで車両を走行させ
る。Anode (hydrogen electrode): H 2 → 2H + + 2e − (4) Cathode (oxygen electrode): 2H + + 2e − + (1/2) O 2 → H 2 O (5) The motor is driven by driving a motor (not shown) by an electromotive force obtained by the electrode reaction.

【００３４】空気量調整手段５には、第１選択酸化部３
Ｂの温度を検出する温度センサ９、第２選択酸化部３Ｃ
の温度を検出する温度センサ１０、第１選択酸化部３Ｂ
に流入するＣＯ濃度を検出するＣＯ濃度センサの検出値
が入力される。空気量調整手段５は、入力された検出値
に応じて第１選択酸化部３Ｂに供給する空気量と第２選
択酸化部３Ｃに供給する空気量を演算し、ポンプ６Ａと
各選択酸化部を連通する通路途中に設置されたバルブ
７、８を演算された空気量となるように制御する。The air amount adjusting means 5 includes a first selective oxidation section 3
Temperature sensor 9 for detecting the temperature of B, second selective oxidation part 3C
Temperature sensor 10 for detecting the temperature of the first selective oxidation unit 3B
The detection value of the CO concentration sensor that detects the concentration of CO flowing into is input. The air amount adjusting means 5 calculates the amount of air to be supplied to the first selective oxidizer 3B and the amount of air to be supplied to the second selective oxidizer 3C according to the input detection value, and the pump 6A and each selective oxidizer are operated. The valves 7 and 8 installed in the communicating passages are controlled so that the calculated air amount is obtained.

【００３５】改質部３Ａ内の温度変化や圧力変化によっ
て、改質ガス中のＣＯ濃度が所定濃度よりも上昇するこ
とがある。このとき、選択酸化部に供給する空気量を増
加させなければ、ＣＯ濃度の高い改質ガスが燃料電池４
に供給され、燃料電池４のＣＯ被毒を招く可能性が生じ
る。しかし、空気量を増加させると選択酸化反応によっ
て選択酸化部が発熱し、触媒が過熱し、劣化することが
ある。そこで本発明では、選択酸化部の触媒温度が触媒
の活性温度範囲の所定の温度よりも低い場合にはその選
択酸化部にのみ供給空気量を増加させ、高い場合には供
給空気量を減少させることによって、温度過上昇による
触媒の劣化を防止しつつ改質ガスのＣＯ濃度を低減させ
る。The CO concentration in the reformed gas may rise above a predetermined concentration due to temperature changes and pressure changes in the reforming section 3A. At this time, unless the amount of air supplied to the selective oxidizer is increased, the reformed gas having a high CO concentration is used as the fuel cell 4.
And CO poisoning of the fuel cell 4 may occur. However, if the amount of air is increased, the selective oxidation part may generate heat due to the selective oxidation reaction, and the catalyst may be overheated and deteriorated. Therefore, in the present invention, when the catalyst temperature of the selective oxidation part is lower than a predetermined temperature in the activation temperature range of the catalyst, the supply air amount is increased only to the selective oxidation part, and when it is high, the supply air amount is decreased. As a result, the CO concentration of the reformed gas is reduced while preventing the deterioration of the catalyst due to the excessive temperature rise.

【００３６】この制御を実施する空気量調整手段５の制
御内容を説明するフローチャートを図２に示す。FIG. 2 shows a flow chart for explaining the control contents of the air amount adjusting means 5 for carrying out this control.

【００３７】まず、ステップＳ１０では温度センサ９に
よって第１選択酸化部３Ｂの温度（触媒温度）を検出す
る。ステップＳ２０では温度センサ１０によって第２選
択酸化部３Ｃの温度（触媒温度）を検出する。ステップ
Ｓ３０では第１選択酸化部３Ｂに流入する改質ガス中の
ＣＯ濃度をＣＯ濃度センサ１１によって検出する。First, in step S10, the temperature (catalyst temperature) of the first selective oxidation section 3B is detected by the temperature sensor 9. In step S20, the temperature sensor 10 detects the temperature (catalyst temperature) of the second selective oxidation unit 3C. In step S30, the CO concentration in the reformed gas flowing into the first selective oxidation unit 3B is detected by the CO concentration sensor 11.

【００３８】続くステップＳ４０では第１選択酸化部３
Ｂに流入する改質ガス中のＣＯ濃度が所定濃度よりも高
いか否かを判定し、高い場合にはステップＳ４１で第１
選択酸化部３Ｂの触媒温度と触媒の所定温度を比較する
（第１選択酸化部３Ｂと第２選択酸化部３Ｃの触媒の所
定温度は同じ温度であるとして説明するが、異なってい
てもよい）。ここで所定温度とは、触媒が活性状態にあ
る温度範囲内に設定される温度とする。In the subsequent step S40, the first selective oxidation unit 3
It is determined whether or not the CO concentration in the reformed gas flowing into B is higher than a predetermined concentration, and if it is higher, the first in step S41.
The catalyst temperature of the selective oxidation unit 3B is compared with a predetermined temperature of the catalyst (the predetermined temperatures of the catalysts of the first selective oxidation unit 3B and the second selective oxidation unit 3C are described as the same temperature, but they may be different). . Here, the predetermined temperature is a temperature set within a temperature range in which the catalyst is in an active state.

【００３９】なお、流入する改質ガス中のＣＯ濃度が所
定濃度以下の場合には、制御を終了する。When the CO concentration in the reformed gas that flows in is equal to or lower than the predetermined concentration, the control ends.

【００４０】ステップＳ４１で第１選択酸化部３Ｂの温
度が所定温度よりも低いと判定された場合には、ステッ
プＳ６０で第１選択酸化部３Ｂの供給空気量を第１選択
酸化部３Ｂに流入する改質ガス中のＣＯ濃度に基づいた
図３に示すマップから算出し、調整する。When it is determined in step S41 that the temperature of the first selective oxidation part 3B is lower than the predetermined temperature, the amount of air supplied to the first selective oxidation part 3B is flown into the first selective oxidation part 3B in step S60. It is calculated and adjusted from the map shown in FIG. 3 based on the CO concentration in the reformed gas.

【００４１】ここで、図３を用いて空気量の算出方法を
説明する。図３は選択酸化部に流入する改質ガス中のＣ
Ｏ濃度（％）、ＣＯ転化率（％）、空気量（Ｌ／ｍｉ
ｎ）の関係を示すグラフである。選択酸化部から排出さ
れる改質ガス中のＣＯ濃度（％）を所定濃度まで低減す
るために必要な空気量が、流入改質ガスのＣＯ濃度とＣ
Ｏ転化率から求められる。ここで、排出改質ガスのＣＯ
濃度、流入改質ガスのＣＯ濃度、ＣＯ転化率の関係は
（６）式のようになる。Here, a method of calculating the air amount will be described with reference to FIG. FIG. 3 shows C in the reformed gas flowing into the selective oxidation section.
O concentration (%), CO conversion (%), air volume (L / mi
It is a graph which shows the relationship of n). The amount of air required to reduce the CO concentration (%) in the reformed gas discharged from the selective oxidation unit to a predetermined concentration is the CO concentration of the inflowing reformed gas and C
It is obtained from the O conversion rate. Here, CO of the exhausted reformed gas
The relationship between the concentration, the CO concentration of the inflowing reformed gas, and the CO conversion rate is as shown in equation (6).

【００４２】 排出ＣＯ濃度＝（１−ＣＯ転化率）×流入ＣＯ濃度 （６） 例えば、流入するＣＯ濃度が２％、ＣＯ転化率が９５％
の場合の必要空気量は図３中の点ａにおける空気量とな
る。図中の点ａにおける空気量を第１選択酸化部３Ｂに
供給することによって、第１選択酸化部３Ｂから排出さ
れる改質ガスのＣＯ濃度は 排出ＣＯ濃度＝（１−０．９５）×２％＝０．１％＝１０００ｐｐｍ （７） となる。この図３の関係を、マップの形式で空気量調整
手段５に記憶する。Exhaust CO concentration = (1-CO conversion rate) × inflow CO concentration (6) For example, the inflowing CO concentration is 2% and the CO conversion rate is 95%.
In this case, the required air amount is the air amount at point a in FIG. By supplying the air amount at the point a in the figure to the first selective oxidation unit 3B, the CO concentration of the reformed gas discharged from the first selective oxidation unit 3B is the exhausted CO concentration = (1−0.95) × 2% = 0.1% = 1000 ppm (7). The relationship of FIG. 3 is stored in the air amount adjusting means 5 in the form of a map.

【００４３】図２のフローチャートに戻り、ステップＳ
４１で、第１選択酸化部３Ｂの温度が所定温度以上の場
合には、温度が触媒の劣化温度以上にならないように供
給空気量を減少し、ステップＳ４２に進む。Returning to the flowchart of FIG. 2, step S
At 41, if the temperature of the first selective oxidation unit 3B is equal to or higher than the predetermined temperature, the supply air amount is reduced so that the temperature does not exceed the deterioration temperature of the catalyst, and the process proceeds to step S42.

【００４４】ステップＳ４２では、第２選択酸化部３Ｃ
の温度と所定温度を比較する。第２選択酸化部３Ｃの温
度が所定温度よりも低いと判定された場合には、ステッ
プＳ７０で第１選択酸化部３Ｂへの流入改質ガスのＣＯ
濃度に基づいたマップから第２選択酸化部３Ｃへ流入す
る改質ガス中のＣＯ濃度を推定する。これは図３の関係
を使って、流入ＣＯ濃度と空気量からＣＯ転化率を算出
し、流入ＣＯ濃度とＣＯ転化率から（６）式により第１
選択酸化部３Ｂから排出される改質ガス中のＣＯ濃度、
すなわち第２選択酸化部３Ｃへ流入する改質ガス中のＣ
Ｏ濃度を推定する。一方、所定温度以上の場合には、第
２選択酸化部３Ｃの温度が触媒の劣化温度以上にならな
いように供給空気量を減少し、制御を終了する。In step S42, the second selective oxidation unit 3C is used.
And the predetermined temperature are compared. If it is determined that the temperature of the second selective oxidation unit 3C is lower than the predetermined temperature, the CO of the reformed gas flowing into the first selective oxidation unit 3B is determined in step S70.
The CO concentration in the reformed gas flowing into the second selective oxidation unit 3C is estimated from the map based on the concentration. This is because the CO conversion rate is calculated from the inflow CO concentration and the air amount using the relationship of FIG.
CO concentration in the reformed gas discharged from the selective oxidation unit 3B,
That is, C in the reformed gas flowing into the second selective oxidation section 3C
Estimate the O concentration. On the other hand, when the temperature is equal to or higher than the predetermined temperature, the supply air amount is reduced so that the temperature of the second selective oxidation unit 3C does not exceed the catalyst deterioration temperature, and the control is ended.

【００４５】次にステップＳ８０では、第２選択酸化部
３Ｃの空気量を第２選択酸化部３Ｃの流入ＣＯ濃度に基
づいたマップから算出し、調整する。すなわち第２選択
酸化部３Ｃについての図３のような関係をマップにして
おいて空気量を算出し、調整する。Next, in step S80, the amount of air in the second selective oxidation section 3C is calculated from the map based on the concentration of CO flowing into the second selective oxidation section 3C and adjusted. That is, the amount of air is calculated and adjusted by setting the map as shown in FIG. 3 for the second selective oxidation unit 3C.

【００４６】したがって、第１、第２選択酸化部の触媒
温度に応じて供給する空気量を制御するため、触媒の劣
化を生じる劣化温度に達することがなく触媒の劣化を防
止し、触媒温度を活性温度に制御しながら効率よく一酸
化炭素を除去することができる。Therefore, since the amount of air to be supplied is controlled according to the catalyst temperatures of the first and second selective oxidizers, the catalyst temperature is prevented from being deteriorated without reaching the deterioration temperature causing the catalyst deterioration, and the catalyst temperature is controlled. Carbon monoxide can be efficiently removed while controlling the activation temperature.

【００４７】また、供給空気量は流入する改質ガスのＣ
Ｏ濃度に基づいて、ＣＯ濃度が所定濃度よりも高いとき
は空気量を増加、濃度が低いときは空気量を減少するよ
うに調整されるため、流入する改質ガスのＣＯ濃度変化
に対して改質ガス中のＣＯ濃度を所定濃度まで低減させ
ることができる。The amount of supplied air is C of the reforming gas flowing in.
Based on the O concentration, when the CO concentration is higher than a predetermined concentration, the air amount is adjusted to increase, and when the concentration is low, the air amount is decreased. The CO concentration in the reformed gas can be reduced to a predetermined concentration.

【００４８】次に本発明の第２の実施形態を説明する。
第２の実施形態は第１選択酸化部３Ｂと第２選択酸化部
３Ｃで上限温度までの温度差が大きい方の空気量を調整
ずるものであり、構成は第１の実施形態の構成図と同じ
である。ここで上限温度とは、触媒が活性状態にある温
度範囲内の温度で、例えば活性温度範囲の最高温度とす
る（以下の実施形態においても同様とする）。Next, a second embodiment of the present invention will be described.
The second embodiment adjusts the amount of air having a larger temperature difference up to the upper limit temperature between the first selective oxidation section 3B and the second selective oxidation section 3C, and the configuration is the same as the configuration diagram of the first embodiment. Is the same. Here, the upper limit temperature is a temperature within a temperature range in which the catalyst is in an active state, and is, for example, the highest temperature in the active temperature range (the same applies to the following embodiments).

【００４９】図４に示す空気量調整手段５が実施するフ
ローチャートを用いて第２の実施形態の動作を説明す
る。The operation of the second embodiment will be described with reference to the flowchart executed by the air amount adjusting means 5 shown in FIG.

【００５０】ステップＳ１０では温度センサ９によって
第１選択酸化部３Ｂの温度を検出する。ステップＳ２０
では温度センサ１０によって第２選択酸化部３Ｃの温度
を検出する。ステップＳ３０ではＣＯ濃度センサ１１に
よって第１選択酸化部３Ｂに流入する改質ガスのＣＯ濃
度を検出する。続くステップＳ４０では第１選択酸化部
３Ｂに流入する改質ガス中の濃度が所定濃度よりも高い
か否かを判定する。ここまでは第１実施形態と同様であ
る。In step S10, the temperature of the first selective oxidation section 3B is detected by the temperature sensor 9. Step S20
Then, the temperature of the second selective oxidation unit 3C is detected by the temperature sensor 10. In step S30, the CO concentration sensor 11 detects the CO concentration of the reformed gas flowing into the first selective oxidation section 3B. In a succeeding step S40, it is determined whether or not the concentration in the reformed gas flowing into the first selective oxidation section 3B is higher than a predetermined concentration. The process up to this point is the same as in the first embodiment.

【００５１】ステップＳ４０で第１選択酸化部３Ｂに流
入する改質ガス中のＣＯ濃度が所定濃度よりも高いか否
かを判定し、高い場合にはステップＳ５１で第１選択酸
化部３Ｂの上限温度までの温度差を算出し、ステップＳ
５２で第２選択酸化部３Ｃの上限温度までの温度差を算
出する。In step S40, it is determined whether or not the CO concentration in the reformed gas flowing into the first selective oxidation part 3B is higher than a predetermined concentration, and if it is higher, the upper limit of the first selective oxidation part 3B is determined in step S51. Calculate the temperature difference up to the temperature, step S
At 52, the temperature difference up to the upper limit temperature of the second selective oxidation section 3C is calculated.

【００５２】ステップＳ５３で第１選択酸化部３Ｂの上
限温度までの温度差と第２選択酸化部３Ｃの上限温度ま
での温度差を比較する。ステップＳ５３で第１選択酸化
部３Ｂの温度差の方が大きいと判定された場合には、ス
テップＳ６０で第１選択酸化部３Ｂの空気量を第１選択
酸化部３Ｂへ流入する改質ガス中のＣＯ濃度に基づいた
図３に示したようなマップから算出し、調整する。In step S53, the temperature difference up to the upper limit temperature of the first selective oxidation section 3B is compared with the temperature difference up to the upper limit temperature of the second selective oxidation section 3C. When it is determined in step S53 that the temperature difference of the first selective oxidation part 3B is larger, in step S60 the amount of air in the first selective oxidation part 3B is in the reformed gas flowing into the first selective oxidation part 3B. Is calculated and adjusted from the map as shown in FIG. 3 based on the CO concentration of.

【００５３】一方、ステップＳ５３で第２選択酸化部３
Ｃの温度差の方が大きいと判定された場合には、ステッ
プＳ７０で第１選択酸化部３Ｂへ流入する改質ガス中の
ＣＯ濃度に基づいたマップから第２選択酸化部３Ｃへ流
入する改質ガス中のＣＯ濃度を推定する。ここで、第２
選択酸化部３Ｃへ流入する改質ガス中のＣＯ濃度は第１
実施形態と同様の方法で推定される。次にステップＳ８
０では、第２選択酸化部３Ｃの空気量を第２選択酸化部
３Ｃへ流入する改質ガス中のＣＯ濃度に基づいたマップ
から算出し、調整する。On the other hand, in step S53, the second selective oxidation unit 3
If it is determined that the temperature difference of C is larger, the map based on the CO concentration in the reformed gas flowing into the first selective oxidation section 3B is introduced into the second selective oxidation section 3C in step S70. Estimate the CO concentration in the quality gas. Where the second
The CO concentration in the reformed gas flowing into the selective oxidation section 3C is the first
It is estimated by the same method as the embodiment. Next, step S8
At 0, the amount of air in the second selective oxidation unit 3C is calculated from the map based on the CO concentration in the reformed gas flowing into the second selective oxidation unit 3C and adjusted.

【００５４】したがって、第１、第２選択酸化部の触媒
温度が反応する上限温度に対してまだ温度上昇に余裕の
ある側の一酸化炭素選択酸化部の空気量を増加させ、余
裕のない側の一酸化炭素選択酸化部の空気量を減少させ
るため、温度過上昇をより精度よく制御することがで
き、触媒の過熱による劣化を防止できるという効果が得
られる。Therefore, the amount of air in the carbon monoxide selective oxidation portion on the side where there is still room for temperature rise relative to the upper limit temperature at which the catalyst temperatures of the first and second selective oxidation portions react is increased, and Since the amount of air in the carbon monoxide selective oxidation unit is reduced, the temperature rise can be controlled more accurately, and the deterioration of the catalyst due to overheating can be prevented.

【００５５】さらに、供給空気量は流入する改質ガスの
ＣＯ濃度に基づいて、ＣＯ濃度が所定濃度よりも高いと
きは空気量を増加、濃度が低いときは空気量を減少する
ように調整されるため、流入する改質ガスのＣＯ濃度変
化に対して改質ガス中のＣＯ濃度を所定濃度まで低減さ
せることができる。Further, the supply air amount is adjusted on the basis of the CO concentration of the inflowing reformed gas so as to increase the air amount when the CO concentration is higher than a predetermined concentration and decrease the air amount when the concentration is low. Therefore, the CO concentration in the reformed gas can be reduced to a predetermined concentration with respect to the change in the CO concentration of the inflowing reformed gas.

【００５６】次に本発明の第３の実施形態を説明する。
第３の実施形態は、第１選択酸化部３Ｂの温度と第２選
択酸化部３Ｃの温度に応じて、一酸化炭素処理の比率を
定めるものであり、構成は第１の実施形態の構成と同じ
である。Next, a third embodiment of the present invention will be described.
In the third embodiment, the ratio of carbon monoxide treatment is determined according to the temperature of the first selective oxidation part 3B and the temperature of the second selective oxidation part 3C. The configuration is the same as that of the first embodiment. Is the same.

【００５７】図５に示す空気量調整手段５が実施するフ
ローチャートを用いて第３の実施形態の動作を説明す
る。ステップＳ１０では、温度センサ９によって第１選
択酸化部３Ｂの温度を検出する。ステップＳ２０では温
度センサ１０によって第２選択酸化部３Ｃの温度を検出
する。ステップＳ３０では第１選択酸化部３Ｂへ流入す
る改質ガス中のＣＯ濃度を検出する。ステップＳ４０で
は第１選択酸化部３Ｂへ流入する改質ガス中のＣＯ濃度
が所定濃度よりも高いか否かを判定する。ここまでの制
御は第１の実施形態と同様である。The operation of the third embodiment will be described with reference to the flowchart executed by the air amount adjusting means 5 shown in FIG. In step S10, the temperature of the first selective oxidation unit 3B is detected by the temperature sensor 9. In step S20, the temperature of the second selective oxidation unit 3C is detected by the temperature sensor 10. In step S30, the CO concentration in the reformed gas flowing into the first selective oxidation section 3B is detected. In step S40, it is determined whether the CO concentration in the reformed gas flowing into the first selective oxidation section 3B is higher than a predetermined concentration. The control up to this point is the same as in the first embodiment.

【００５８】ステップＳ４０で、第１選択酸化部３Ｂへ
流入する改質ガス中のＣＯ濃度が所定濃度よりも高いか
否かを判定し、高い場合にはステップＳ９０で第１選択
酸化部３Ｂの温度と第２選択酸化部３Ｃの温度に応じて
それぞれの選択酸化部における一酸化炭素処理比率を決
定する。In step S40, it is determined whether or not the CO concentration in the reformed gas flowing into the first selective oxidation part 3B is higher than a predetermined concentration. The carbon monoxide treatment ratio in each selective oxidation part is determined according to the temperature and the temperature of the second selective oxidation part 3C.

【００５９】一酸化炭素処理比率は、図６に示すように
触媒が活性する上限温度からの温度差に応じて決定され
る。第１選択酸化部３Ｂの温度と上限温度の差をΔ
Ｔ1、第２選択酸化部３Ｃの温度と上限温度の差をΔＴ2
であるとすると、第１選択酸化部３Ｂと第２選択酸化部
３Ｃの一酸化炭素処理率を△Ｔ1：△Ｔ2の割合で増加さ
せる。第１選択酸化部３Ｂと第２選択酸化部３Ｃにおけ
るＣＯ転化率の所定値からの上乗せ分をそれぞれ△
ｎ1、△ｎ2とし、△ｎ1、△ｎ2を以下の割合で決定す
る。The carbon monoxide treatment ratio is determined according to the temperature difference from the upper limit temperature at which the catalyst is activated as shown in FIG. The difference between the temperature of the first selective oxidation unit 3B and the upper limit temperature is Δ
T 1 , the difference between the temperature of the second selective oxidation part 3C and the upper limit temperature is ΔT 2
Then, the carbon monoxide treatment rate of the first selective oxidation part 3B and the second selective oxidation part 3C is increased at a ratio of ΔT 1 : ΔT 2 . The addition of the CO conversion rate in the first selective oxidation section 3B and the second selective oxidation section 3C from the predetermined value is Δ, respectively.
Let n 1 and Δn 2, and determine Δn 1 and Δn 2 at the following ratios.

【００６０】△ｎ1：△ｎ2＝△Ｔ1：△Ｔ2 （８） （８）式より以下の関係が成り立つ。Δn 1 : Δn 2 = ΔT 1 : ΔT 2 (8) From the equation (8), the following relationship is established.

【００６１】△ｎ1×△Ｔ2＝△ｎ2×△Ｔ1 （９） 第１選択酸化部３Ｂと第２選択酸化部３Ｃの所定の転化
率をそれぞれ９５％、９８％とし、第２選択酸化部３Ｃ
から排出される改質ガス中の所定のＣＯ濃度を２０ｐｐ
ｍとする。第１選択酸化部３Ｂへ流入する改質ガス中の
ＣＯ濃度をＣｉｎとすると、Ｃｉｎを２０ｐｐｍまで処
理するためにはＣｉｎと△ｎ1、△ｎ2の関係が次式のよ
うになればよい。Δn 1 × ΔT 2 = Δn 2 × ΔT 1 (9) The predetermined conversion rates of the first selective oxidation part 3B and the second selective oxidation part 3C are set to 95% and 98%, respectively. Selective oxidation part 3C
20ppm of specified CO concentration in the reformed gas discharged from
m. Assuming that the CO concentration in the reformed gas flowing into the first selective oxidation section 3B is Cin, in order to process Cin up to 20 ppm, the relationship between Cin and Δn 1 and Δn 2 may be expressed by the following equation. .

【００６２】 Ｃｉｎ×（１−０．９５−△ｎ1）×（１−０．９８−△ｎ2）＝０．００２ （１０） したがって、（９）式、（１０）式から△ｎ1、△ｎ2が
求まる。Cin × (1−0.95-Δn 1 ) × (1−0.98−Δn 2 ) = 0.002 (10) Therefore, from the expressions (9) and (10), Δn 1 , Δn 2 is obtained.

【００６３】次にステップＳ１００で、第１選択酸化部
３Ｂの空気量を第１選択酸化部３Ｂの一酸化炭素処理比
率（転化率０．９５＋△ｎ1）、第１選択酸化部３Ｂへ
流入する改質ガス中のＣＯ濃度に基づいた図３に示した
ようなマップから算出し、調整する。Next, at step S100, the amount of air in the first selective oxidation section 3B is flown into the first selective oxidation section 3B by the carbon monoxide treatment ratio (conversion rate 0.95 + Δn 1 ). It is calculated and adjusted from the map as shown in FIG. 3 based on the CO concentration in the reformed gas.

【００６４】次にステップＳ１１０で、第２選択酸化部
３Ｃの空気量を第２選択酸化部３Ｃの一酸化炭素処理比
率（転化率０．９８＋△ｎ2、）及び第２選択酸化部３
Ｃへ流入する改質ガス中のＣＯ濃度に基づいたマップか
ら算出し、調整する。ここで、第２選択酸化部３Ｃへ流
入する改質ガス中のＣＯ濃度は第１実施形態と同様の方
法で推定される。Next, in step S110, the amount of air in the second selective oxidation section 3C is set to the carbon monoxide treatment ratio (conversion rate 0.98 + Δn 2 ) and the second selective oxidation section 3C.
It is calculated and adjusted from a map based on the CO concentration in the reformed gas flowing into C. Here, the CO concentration in the reformed gas flowing into the second selective oxidation section 3C is estimated by the same method as in the first embodiment.

【００６５】したがって、各選択酸化部の空気量を各部
の温度に応じた比率で増加させるため、温度過上昇によ
る触媒の劣化を防止できるという効果に加えて、上限温
度に達してない選択酸化部全てを有効に利用することが
でき、効果的に改質ガスのＣＯ濃度を低減することがで
きるという効果が得られる。Therefore, since the amount of air in each selective oxidation unit is increased at a ratio according to the temperature of each unit, in addition to the effect that the catalyst deterioration due to the excessive temperature rise can be prevented, the selective oxidation unit that has not reached the upper limit temperature. All of them can be effectively used, and the CO concentration of the reformed gas can be effectively reduced.

【００６６】さらに、供給空気量は流入する改質ガスの
ＣＯ濃度に基づいて、ＣＯ濃度が所定濃度よりも高いと
きは空気量を増加、濃度が低いときは空気量を減少する
ように調整されるため、流入する改質ガスのＣＯ濃度変
化に対して改質ガス中のＣＯ濃度を所定濃度まで低減さ
せることができる。Further, the supply air amount is adjusted based on the CO concentration of the inflowing reformed gas so as to increase the air amount when the CO concentration is higher than a predetermined concentration and decrease the air amount when the concentration is low. Therefore, the CO concentration in the reformed gas can be reduced to a predetermined concentration with respect to the change in the CO concentration of the inflowing reformed gas.

【００６７】次に本発明の第４の実施形態を説明する。
図７は第４の実施形態を示す構成図である。第１の実施
形態の構成に対して追加されたＣＯ濃度センサ１２は、
改質器３から排出される改質ガスのＣＯ濃度を検出す
る。改質ガス中のＣＯ濃度が所定値よりも高いときに、
ＣＯ濃度が所定値以下になるまで、第１選択酸化部３Ｂ
あるいは第２選択酸化部３Ｃのどちらか温度が低い方の
空気量を増加し、一酸化炭素の除去能力を高める。Next, a fourth embodiment of the present invention will be described.
FIG. 7 is a block diagram showing the fourth embodiment. The CO concentration sensor 12 added to the configuration of the first embodiment is
The CO concentration of the reformed gas discharged from the reformer 3 is detected. When the CO concentration in the reformed gas is higher than a predetermined value,
Until the CO concentration falls below a predetermined value, the first selective oxidation unit 3B
Alternatively, the air amount of the lower temperature of the second selective oxidation unit 3C, whichever is lower, is increased to enhance the carbon monoxide removal capability.

【００６８】図８に示す空気量調整手段５が実施するフ
ローチャートを用いて第４の実施形態の動作を説明す
る。ステップＳ１０では温度センサ９によって第１選択
酸化部３Ｂの温度を検出する。ステップＳ２０では温度
センサ１０によって第２選択酸化部３Ｃの温度を検出す
る。ステップＳ１２０では第２選択酸化部３Ｃから排出
される改質ガスのＣＯ濃度、すなわち改質器３から排出
される改質ガスのＣＯ濃度を検出する。The operation of the fourth embodiment will be described with reference to the flowchart executed by the air amount adjusting means 5 shown in FIG. In step S10, the temperature sensor 9 detects the temperature of the first selective oxidation unit 3B. In step S20, the temperature of the second selective oxidation unit 3C is detected by the temperature sensor 10. In step S120, the CO concentration of the reformed gas discharged from the second selective oxidation unit 3C, that is, the CO concentration of the reformed gas discharged from the reformer 3 is detected.

【００６９】ステップＳ１３０では第２選択酸化部３Ｃ
から排出される改質ガスのＣＯ濃度が所定濃度よりも高
いか否かを判定し、高い場合にはステップＳ１４１で第
１選択酸化部３Ｂの上限温度までの温度差を算出し、ス
テップＳ１４２で第２選択酸化部３Ｃの上限温度までの
温度差を算出する。ステップＳ１４３で第１選択酸化部
３Ｂの上限温度までの温度差と第２選択酸化部３Ｃの上
限温度までの温度差を比較する。ステップＳ１４３で第
１選択酸化部３Ｂの温度差の方が大きいと判定された場
合には、ステップ１５０で第１選択酸化部３Ｂの空気量
を増加する。逆に高いと判定されなかった場合にはステ
ップＳ１６０で第２選択酸化部３Ｃの空気量を増加す
る。In step S130, the second selective oxidation unit 3C is used.
It is determined whether or not the CO concentration of the reformed gas discharged from the exhaust gas is higher than a predetermined concentration, and if it is higher, the temperature difference up to the upper limit temperature of the first selective oxidation section 3B is calculated in step S141, and in step S142. The temperature difference up to the upper limit temperature of the second selective oxidation part 3C is calculated. In step S143, the temperature difference up to the upper limit temperature of the first selective oxidation unit 3B and the temperature difference up to the upper limit temperature of the second selective oxidation unit 3C are compared. When it is determined in step S143 that the temperature difference of the first selective oxidation part 3B is larger, the amount of air in the first selective oxidation part 3B is increased in step 150. On the contrary, if it is not determined to be high, the amount of air in the second selective oxidation unit 3C is increased in step S160.

【００７０】本実施形態は、改質器３から排出される改
質ガス中のＣＯ濃度が所定濃度より高いときに、ＣＯ濃
度が所定濃度以下になるよう、空気量を上限温度との差
が大きい選択酸化部の温度に応じて調整する構成とし
た。In this embodiment, when the CO concentration in the reformed gas discharged from the reformer 3 is higher than the predetermined concentration, the difference between the air amount and the upper limit temperature is set so that the CO concentration becomes equal to or lower than the predetermined concentration. The configuration is adjusted according to the temperature of the large selective oxidation portion.

【００７１】したがって、ＣＯ選択酸化部に所定の空気
量が供給されても、温度変化や触媒の劣化などによって
排出される一酸化炭素濃度がばらつく場合に、改質器か
ら排出される改質ガス中ＣＯ濃度を検出して空気量を調
整するので、改質ガス中のＣＯ濃度がばらついたときに
もＣＯ濃度を確実に低減させることが可能である。Therefore, even if a predetermined amount of air is supplied to the CO selective oxidizer, the reformed gas discharged from the reformer when the concentration of carbon monoxide discharged varies due to temperature change or catalyst deterioration. Since the medium CO concentration is detected and the air amount is adjusted, it is possible to reliably reduce the CO concentration even when the CO concentration in the reformed gas varies.

【００７２】また、本発明によれば、触媒が活性する上
限温度に対してまだ温度上昇に余裕のある一酸化炭素選
択酸化部の空気量を増加させ、余裕のない一酸化炭素選
択酸化部の空気量を減少させるため、温度過上昇による
触媒の劣化を防止できるという効果が得られる。Further, according to the present invention, the amount of air in the carbon monoxide selective oxidation part which has a margin of temperature increase with respect to the upper limit temperature at which the catalyst is activated is increased, and the carbon monoxide selective oxidation part having a margin of increase is not generated. Since the amount of air is reduced, it is possible to prevent deterioration of the catalyst due to excessive temperature rise.

【００７３】次に本発明の第５の実施形態を説明する。
第５の実施形態は第１選択酸化部３Ｂの温度と第２選択
酸化部３Ｃの温度に応じて、一酸化炭素処理の比率を求
めるものであり、構成は、図７に示した第４の実施形態
の構成と同じである。Next, a fifth embodiment of the present invention will be described.
In the fifth embodiment, the ratio of carbon monoxide treatment is determined according to the temperature of the first selective oxidation part 3B and the temperature of the second selective oxidation part 3C. The configuration is the same as that of the fourth selective oxidation part shown in FIG. The configuration is the same as that of the embodiment.

【００７４】図９に示すフローチャートを用いて第５の
実施形態の動作を説明する。ステップＳ１０では温度セ
ンサ９によって第１選択酸化部３Ｂの温度を検出する。
ステップＳ２０では温度センサ１０によって第２選択酸
化部３Ｃの温度を検出する。The operation of the fifth embodiment will be described with reference to the flowchart shown in FIG. In step S10, the temperature sensor 9 detects the temperature of the first selective oxidation unit 3B.
In step S20, the temperature of the second selective oxidation unit 3C is detected by the temperature sensor 10.

【００７５】続くステップＳ１２０では、第２選択酸化
部３Ｃから排出される改質ガスのＣＯ濃度、すなわち改
質器３から排出される改質ガスのＣＯ濃度を検出する。
ステップＳ１３０では第２選択酸化部３Ｃからの改質ガ
スのＣＯ濃度が所定濃度よりも高いか否かを判定し、高
い場合にはステップＳ１７０に進み、以下のときには制
御を終了する。In the subsequent step S120, the CO concentration of the reformed gas discharged from the second selective oxidation section 3C, that is, the CO concentration of the reformed gas discharged from the reformer 3 is detected.
In step S130, it is determined whether or not the CO concentration of the reformed gas from the second selective oxidation section 3C is higher than a predetermined concentration, the process proceeds to step S170 if it is higher, and the control is ended in the following cases.

【００７６】ステップＳ１７０で第１選択酸化部３Ｂと
第２選択酸化部３Ｃの温度に応じて空気量増加比率を決
定する。空気量増加比率は、第３の実施形態で図６を用
いて説明した一酸化炭素処理比率を求める方法と同様で
ある。次にステップＳ１８０では、空気量増加比率に応
じて第１選択酸化部３Ｂ、第２選択酸化部３Ｃそれぞれ
の空気量を増加する。In step S170, the air amount increase ratio is determined according to the temperatures of the first selective oxidation section 3B and the second selective oxidation section 3C. The air amount increase ratio is the same as the method for obtaining the carbon monoxide treatment ratio described in the third embodiment with reference to FIG. Next, in step S180, the air amount of each of the first selective oxidation unit 3B and the second selective oxidation unit 3C is increased according to the air amount increase ratio.

【００７７】したがって、ＣＯ選択酸化部に所定の空気
量が供給されても、温度変化や触媒の劣化などによって
ＣＯ選択酸化部から排出される改質ガス中のＣＯ濃度が
ばらつくこともある。本実施形態によれば改質ガス中の
ＣＯ濃度を検出して空気量を調整するので、改質ガス中
のＣＯ濃度がばらついたときにもＣＯ濃度を確実に低減
させることが可能である。Therefore, even if a predetermined amount of air is supplied to the CO selective oxidization unit, the CO concentration in the reformed gas discharged from the CO selective oxidization unit may fluctuate due to a temperature change or deterioration of the catalyst. According to the present embodiment, the CO concentration in the reformed gas is detected and the air amount is adjusted, so that the CO concentration can be reliably reduced even when the CO concentration in the reformed gas varies.

【００７８】第２の実施形態では特定の選択酸化部の空
気量を増加させるのに対して、本実施形態では各選択酸
化部の空気量を各部の温度に応じた比率で増加させるた
め、温度過上昇による触媒の劣化を防止できるという効
果に加えて、上限温度に達してない選択酸化部全てを有
効に利用することができ、効果的に改質ガスのＣＯ濃度
を低減することができるという効果が得られる。In the second embodiment, the amount of air in a specific selective oxidation unit is increased, whereas in the present embodiment, the amount of air in each selective oxidation unit is increased at a rate according to the temperature of each unit, so that the temperature In addition to the effect of preventing deterioration of the catalyst due to excessive temperature rise, it is possible to effectively use all of the selective oxidation part that has not reached the upper limit temperature, and to effectively reduce the CO concentration of the reformed gas. The effect is obtained.

【００７９】次に本発明の第６の実施形態を説明する。
図１０は第６の実施形態を示す構成図である。第１の実
施形態のＣＯ濃度センサ１１に代えて、流量センサ１３
を設置する。流量センサ１３は、改質器３に流入する改
質ガス流量を検出する。改質器３に流入するガス流量が
定格流量よりも大きいときに、流入ガス流量と第１選択
酸化部３Ｂと第２選択酸化部３Ｃの温度の温度に基づい
て空気量を増加する。Next explained is the sixth embodiment of the invention.
FIG. 10 is a block diagram showing the sixth embodiment. Instead of the CO concentration sensor 11 of the first embodiment, the flow rate sensor 13
Set up. The flow rate sensor 13 detects the reformed gas flow rate flowing into the reformer 3. When the gas flow rate flowing into the reformer 3 is larger than the rated flow rate, the air amount is increased based on the inflow gas flow rate and the temperatures of the temperatures of the first selective oxidation section 3B and the second selective oxidation section 3C.

【００８０】図１１に示すフローチャートを用いて第６
の実施形態の動作を説明する。ステップＳ１０では温度
センサ９によって第１選択酸化部３Ｂの温度を検出す
る。ステップＳ２０では温度センサ１０によって第２選
択酸化部３Ｃの温度を検出する。The sixth step using the flowchart shown in FIG.
The operation of this embodiment will be described. In step S10, the temperature sensor 9 detects the temperature of the first selective oxidation unit 3B. In step S20, the temperature of the second selective oxidation unit 3C is detected by the temperature sensor 10.

【００８１】ステップＳ１２１では第１選択酸化部３Ｂ
に流入する改質ガス流量（改質器３の流入ガス流量に相
当する）を流量センサ１３によって検出する。In step S121, the first selective oxidation part 3B is used.
The flow rate sensor 13 detects the flow rate of the reformed gas (corresponding to the flow rate of the inflow gas of the reformer 3).

【００８２】続く、ステップＳ１３１では第１選択酸化
部３Ｂに流入する改質ガスの流量が定格流量から変化し
たか否かを判定し、変化した場合には第１選択酸化部３
Ｂへの空気量を第１選択酸化部３Ｂに流入する改質ガス
流量に基づいたマップから算出する。このマップは、例
えば、図１２（ａ）に示すような改質ガス流量に対して
必要な空気量Ｑａ１の関係になる。図１２（ａ）の関係
をマップにしておく。Then, in step S131, it is determined whether or not the flow rate of the reformed gas flowing into the first selective oxidation section 3B has changed from the rated flow rate.
The amount of air to B is calculated from the map based on the flow rate of the reformed gas flowing into the first selective oxidation section 3B. This map has, for example, the relationship of the required air amount Qa1 with respect to the reformed gas flow rate as shown in FIG. The relationship shown in FIG. 12A is made into a map.

【００８３】次に、第２選択酸化部３Ｃ空気量について
も第１選択酸化部３Ｂと同様に、第１選択酸化部３Ｂへ
の改質ガス流量に基づいたマップから算出する。図１２
（ｂ）に改質ガス流量に対して必要な空気量Ｑａ２の関
係を示す。図１２（ｂ）の関係をマップにしておく。Next, the air amount of the second selective oxidation unit 3C is also calculated from the map based on the reformed gas flow rate to the first selective oxidation unit 3B, similarly to the first selective oxidation unit 3B. 12
(B) shows the relationship of the required air amount Qa2 with respect to the reformed gas flow rate. The relationship of FIG. 12 (b) is made into a map.

【００８４】ステップＳ１７３で第１選択酸化部３Ｂと
第２選択酸化部３Ｃの温度に応じて空気量増減比率を決
定する。空気量増減比率は、図６で説明した一酸化炭素
処理比率を求めるのと同様の方法で求める。In step S173, the air amount increase / decrease ratio is determined according to the temperatures of the first selective oxidation section 3B and the second selective oxidation section 3C. The air amount increase / decrease ratio is obtained by the same method as that for obtaining the carbon monoxide treatment ratio described in FIG.

【００８５】次にステップＳ１７４では、マップから算
出した第１選択酸化部３Ｂの空気量Ｑａ１と第２選択酸
化部３Ｃの空気量Ｑａ２を空気量増減比率△Ｔ1：△Ｔ2
に応じて補正する。例えば、以下のように補正する。Next, at step S174, the air amount Qa1 of the first selective oxidation unit 3B and the air amount Qa2 of the second selective oxidation unit 3C calculated from the map are changed in air amount ΔT 1 : ΔT 2.
Correct according to. For example, the correction is made as follows.

【００８６】 Ｑａ１’＝第１選択酸化部３Ｂの定格流量＋△Ｑａ１×２ΔＴ1／（△Ｔ1 ＋△Ｔ2） （１１） Ｑａ２’＝第２選択酸化部３Ｃの定格流量＋△Ｑａ２×２ΔＴ2／（△Ｔ1 ＋△Ｔ2） （１２） ここで、Ｑａ１’とＱａ２’はそれぞれ第１選択酸化部
３Ｂと第２選択酸化部３Ｃの補正後の空気量、△Ｑａ１
は第１選択酸化部３Ｂの定格流量とＱａ１との差、△Ｑ
ａ２は第２選択酸化部３Ｃの定格流量とＱａ２との差で
ある。Qa1 ′ = rated flow rate of the first selective oxidation part 3B + ΔQa1 × 2ΔT 1 / (ΔT 1 + ΔT 2 ) (11) Qa2 ′ = rated flow rate of the second selective oxidation part 3C + ΔQa2 × 2ΔT 2 / (ΔT 1 + ΔT 2 ) (12) Here, Qa1 ′ and Qa2 ′ are the corrected air amounts of the first selective oxidation part 3B and the second selective oxidation part 3C, respectively, and ΔQa1.
Is the difference between the rated flow rate of the first selective oxidation unit 3B and Qa1, ΔQ
a2 is the difference between the rated flow rate of the second selective oxidation unit 3C and Qa2.

【００８７】したがって、流入する改質ガスの流量が変
化すると、ＣＯを酸化させるために必要な空気量も変化
する。流量が増加したときは空気量が増加、流量が減少
したときは空気量が減少するように調整することによっ
て、流入する改質ガスの流量変化に応じて改質ガス中の
ＣＯを所定濃度まで低減させることができる。Therefore, when the flow rate of the reformed gas that flows in changes, the amount of air required to oxidize CO also changes. By adjusting so that the air amount increases when the flow rate increases and the air amount decreases when the flow rate decreases, the CO in the reformed gas reaches a predetermined concentration according to the change in the flow rate of the reformed gas that flows in. Can be reduced.

【００８８】また、第２の実施形態では特定の選択酸化
部の空気量を増加させるのに対して、本実施形態では各
選択酸化部の空気量を各部の温度に応じた比率で増加さ
せるため、温度過上昇による触媒の劣化を防止できると
いう効果に加えて、上限温度に達してない選択酸化部全
てを有効に利用することができ、効果的に改質ガスのＣ
Ｏ濃度を低減することができるという効果が得られる。Further, in the second embodiment, the amount of air in a specific selective oxidation portion is increased, whereas in the present embodiment, the amount of air in each selective oxidation portion is increased at a ratio according to the temperature of each portion. In addition to the effect that the catalyst deterioration due to the excessive temperature rise can be prevented, it is possible to effectively utilize all of the selective oxidization portion that has not reached the upper limit temperature, and to effectively improve the C of the reformed gas.
The effect that the O concentration can be reduced is obtained.

【００８９】次に本発明の第７の実施形態を説明する。
図１３は第７の実施形態を示す構成図である。第７の実
施形態はＣＯ濃度センサや流量センサを用いない場合で
ある。定格運転で、ＣＯ濃度やガス流量が一定のときを
想定している。Next, a seventh embodiment of the present invention will be described.
FIG. 13 is a block diagram showing the seventh embodiment. The seventh embodiment is a case where no CO concentration sensor or flow rate sensor is used. It is assumed that the CO concentration and the gas flow rate are constant in the rated operation.

【００９０】図１４に示すフローチャートを用いて第７
の実施形態の動作を説明する。ステップＳ１０では温度
センサによって第１選択酸化部３Ｂの温度を検出する。
ステップＳ２０では第２選択酸化部３Ｃの温度を検出す
る。The seventh step using the flowchart shown in FIG.
The operation of this embodiment will be described. In step S10, the temperature of the first selective oxidation unit 3B is detected by the temperature sensor.
In step S20, the temperature of the second selective oxidation part 3C is detected.

【００９１】ステップＳ１７３で第１選択酸化部３Ｂと
第２選択酸化部３Ｃの温度に応じて空気量増減比率を決
定する。空気量増減比率は、図６で説明した一酸化炭素
処理比率を求めるのと同様の方法で求める。次にステッ
プＳ１７５では、第１選択酸化部３Ｂの定格空気量Ｑｎ
ａ１、第２選択酸化部３Ｃの定格空気量Ｑｎａ２を空気
量増減比率△Ｔ1：△Ｔ2に応じて例えば以下のように補
正する。In step S173, the air amount increase / decrease ratio is determined according to the temperatures of the first selective oxidation part 3B and the second selective oxidation part 3C. The air amount increase / decrease ratio is obtained by the same method as that for obtaining the carbon monoxide treatment ratio described in FIG. Next, in step S175, the rated air amount Qn of the first selective oxidation unit 3B is set.
a1, the rated air amount Qna2 of the second selective oxidation unit 3C is corrected according to the air amount increase / decrease ratio ΔT 1 : ΔT 2 , for example, as follows.

【００９２】 Ｑｎａ１’＝Ｑｎａ１＋Ｃ１×△Ｔ1／（△Ｔ1十△Ｔ2） （１３） Ｑｎａ２’＝Ｑｎａ２＋Ｃ２×△Ｔ2／（△Ｔ1十△Ｔ2） （１４） ここで、Ｑｎａ１'とＱｎａ２'はそれぞれ第１選択酸化
部３Ｂと第２選択酸化部３Ｃの補正後の空気量である。
Ｃ１とＣ２は、補正係数であり、実験的に求める。Qna1 ′ = Qna1 + C1 × ΔT 1 / (ΔT 1 tens ΔT 2 ) (13) Qna2 ′ = Qna2 + C2 × ΔT 2 / (ΔT 1 tens ΔT 2 ) (14) Here, Qna1 ′ And Qna2 ′ are the corrected air amounts of the first selective oxidation part 3B and the second selective oxidation part 3C, respectively.
C1 and C2 are correction coefficients, which are experimentally obtained.

【００９３】したがって、ＣＯ濃度センサや流量センサ
を用いることなく、ＣＯ濃度を低減することができるの
で、システムの低価格化を図ることができる。Therefore, the CO concentration can be reduced without using the CO concentration sensor or the flow rate sensor, so that the cost of the system can be reduced.

【００９４】第２の実施形態では、特定の一酸化炭素選
択酸化部の空気量を増加させるのに対して、本実施形態
では、各一酸化炭素選択酸化部の空気量を各部の温度に
応じた比率で増加させるため、温度過上昇による触媒の
劣化を防止できるという効果に加えて、上限温度に達し
てない一酸化炭素選択酸化部全てを有効に利用すること
ができ、効果的に改質ガスの一酸化炭素濃度を低減する
ことができるという効果が得られる。In the second embodiment, the amount of air in the specific carbon monoxide selective oxidation portion is increased, whereas in the present embodiment, the amount of air in each carbon monoxide selective oxidation portion is changed according to the temperature of each portion. In addition to the effect of preventing catalyst deterioration due to excessive temperature rise, it is possible to effectively use all of the carbon monoxide selective oxidation part that has not reached the upper limit temperature, and effective reforming is possible. The effect that the carbon monoxide concentration of the gas can be reduced is obtained.

【００９５】本発明は、上記した実施形態に限定される
ものではなく、本発明の技術的思想の範囲内でさまざま
な変更がなしうることは明白である。The present invention is not limited to the above-mentioned embodiments, and it is obvious that various modifications can be made within the scope of the technical idea of the present invention.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の第１の実施形態、第２の実施形態、第
３の実施形態の構成図である。FIG. 1 is a configuration diagram of a first embodiment, a second embodiment, and a third embodiment of the present invention.

【図２】第１実施形態のフローチャート図である。FIG. 2 is a flowchart of the first embodiment.

【図３】一酸化炭素選択酸化部に流入する改質ガス中の
一酸化炭素濃度、一酸化炭素転化率、空気量の関係図で
ある。FIG. 3 is a relationship diagram of a carbon monoxide concentration, a carbon monoxide conversion rate, and an air amount in a reformed gas flowing into a carbon monoxide selective oxidation section.

【図４】第２実施形態のフローチャート図である。FIG. 4 is a flow chart of the second embodiment.

【図５】第３実施形態のフローチャート図である。FIG. 5 is a flow chart of the third embodiment.

【図６】各一酸化炭素選択酸化部の温度に応じた一酸化
炭素処理比率の求めかたを示す図である。FIG. 6 is a diagram showing how to determine a carbon monoxide treatment ratio according to the temperature of each carbon monoxide selective oxidation portion.

【図７】第４の実施形態、第５の実施形態の構成図であ
る。FIG. 7 is a configuration diagram of a fourth embodiment and a fifth embodiment.

【図８】第４実施形態のフローチャート図である。FIG. 8 is a flowchart of the fourth embodiment.

【図９】第５実施形態のフローチャート図である。FIG. 9 is a flowchart of the fifth embodiment.

【図１０】第６の実施形態の構成図である。FIG. 10 is a configuration diagram of a sixth embodiment.

【図１１】第６実施形態のフローチャート図である。FIG. 11 is a flowchart of the sixth embodiment.

【図１２】一酸化炭素選択酸化部に流入する改質ガスの
流量と、一酸化炭素選択酸化部への供給空気量の関係で
ある。FIG. 12 is a relationship between the flow rate of the reformed gas flowing into the carbon monoxide selective oxidation section and the amount of air supplied to the carbon monoxide selective oxidation section.

【図１３】第７の実施形態の構成図である。FIG. 13 is a configuration diagram of a seventh embodiment.

【図１４】第７実施形態のフローチャート図である。FIG. 14 is a flowchart of the seventh embodiment.

【符号の説明】[Explanation of symbols]

１ 燃料タンク ２ 水タンク ３ 改質器 ３Ａ 改質部 ３Ｂ 第１選択酸化部 ３Ｃ 第２選択酸化部 ４ 燃料電池 ５ 空気量調整手段 ６Ａ、６Ｂ ポンプ ７、８ バルブ ９ 温度センサ １０ 温度センサ １１ ＣＯ濃度センサ １２ ＣＯ濃度センサ １３ 流量センサ 1 fuel tank 2 water tank 3 reformer 3A reforming section 3B First selective oxidation part 3C 2nd selective oxidation part 4 fuel cells 5 Air volume adjustment means 6A, 6B pump 7,8 valves 9 Temperature sensor 10 Temperature sensor 11 CO concentration sensor 12 CO concentration sensor 13 Flow rate sensor

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】改質ガスに含まれる一酸化炭素を選択的に
酸化することにより、改質ガス中の一酸化炭素濃度を低
減する一酸化炭素選択酸化手段を複数個、直列に設置す
る一酸化炭素除去装置において、 それぞれの一酸化炭素選択酸化手段の触媒温度を検出す
る温度検出手段と、 前記検出された触媒温度に応じて、各一酸化炭素選択酸
化手段に供給する空気量を調整する空気量調整手段とを
備えたことを特徴とする一酸化炭素除去装置。1. A plurality of carbon monoxide selective oxidation means for reducing the carbon monoxide concentration in the reformed gas by selectively oxidizing carbon monoxide contained in the reformed gas. In the carbon oxide removing device, temperature detecting means for detecting the catalyst temperature of each carbon monoxide selective oxidizing means, and the amount of air supplied to each carbon monoxide selective oxidizing means is adjusted according to the detected catalyst temperature. An apparatus for removing carbon monoxide, comprising: an air amount adjusting means. 【請求項２】前記空気量調整手段は、触媒温度が所定温
度よりも低い一酸化炭素選択酸化手段への空気量を増量
し、触媒温度が所定温度よりも高い一酸化炭素選択酸化
手段への空気量を減量することを特徴とする請求項１に
記載の一酸化炭素除去装置。2. The air amount adjusting means increases the amount of air to a carbon monoxide selective oxidizing means whose catalyst temperature is lower than a predetermined temperature, and supplies it to a carbon monoxide selective oxidizing means whose catalyst temperature is higher than a predetermined temperature. The carbon monoxide removing device according to claim 1, wherein the amount of air is reduced. 【請求項３】前記空気量調整手段は、それぞれの一酸化
炭素選択酸化手段における触媒温度と触媒の活性上限温
度との差を算出し、活性上限温度までの温度差が大きい
一酸化炭素選択酸化手段の空気量を増量し、活性上限温
度までの温度差が小さい一酸化炭素選択酸化手段の空気
量を減量することを特徴とする請求項１に記載の一酸化
炭素除去装置。3. The carbon monoxide selective oxidation in which the air amount adjusting means calculates the difference between the catalyst temperature in each of the carbon monoxide selective oxidation means and the catalyst upper limit temperature, and has a large temperature difference up to the activity upper limit temperature. 2. The carbon monoxide removing apparatus according to claim 1, wherein the air amount of the means is increased and the air amount of the carbon monoxide selective oxidation means having a small temperature difference up to the activation upper limit temperature is decreased. 【請求項４】前記空気量調整手段は、それぞれの一酸化
炭素選択酸化手段における触媒温度と触媒の活性上限温
度との温度差に応じてそれぞれの一酸化炭素選択酸化手
段での選択酸化処理する分担の比率を算出し、この比率
に基づいてそれぞれの一酸化炭素選択酸化手段の空気量
を調整することを特徴とする請求項１に記載の一酸化炭
素除去装置。4. The air amount adjusting means performs a selective oxidation process in each carbon monoxide selective oxidation means according to a temperature difference between a catalyst temperature in each carbon monoxide selective oxidation means and a catalyst activation upper limit temperature. The carbon monoxide removing device according to claim 1, wherein a ratio of sharing is calculated, and the amount of air of each carbon monoxide selective oxidizing means is adjusted based on the ratio. 【請求項５】最上流に位置する一酸化炭素選択酸化手段
に流入する改質ガス中の一酸化炭素濃度を検出する手段
を設け、 前記空気量調整手段は、検出された改質ガスの一酸化炭
素濃度が所定濃度範囲にない場合に、改質ガス中の一酸
化炭素濃度が所定濃度範囲に入るように、流入する改質
ガス中の一酸化炭素濃度とそれぞれの一酸化炭素選択酸
化手段の触媒温度に応じて各一酸化炭素選択酸化手段へ
の供給空気量を調整することを特徴とする請求項１から
請求項４のいずれか一つに記載の一酸化炭素除去装置。5. A means for detecting the carbon monoxide concentration in the reformed gas flowing into the carbon monoxide selective oxidation means located at the uppermost stream is provided, and the air amount adjusting means is one of the detected reformed gases. The carbon monoxide concentration in the inflowing reformed gas and the respective carbon monoxide selective oxidation means so that the carbon monoxide concentration in the reformed gas falls within the predetermined concentration range when the carbon oxide concentration is not within the predetermined concentration range. The carbon monoxide removing device according to any one of claims 1 to 4, wherein the amount of air supplied to each carbon monoxide selective oxidizing means is adjusted according to the catalyst temperature of. 【請求項６】最下流に位置する一酸化炭素選択酸化手段
から排出される改質ガス中の一酸化炭素濃度を検出する
手段を設け、 前記空気量調整手段は、検出された改質ガス中の一酸化
炭素濃度が所定濃度範囲にない場合に、改質ガス中の一
酸化炭素濃度が所定濃度範囲に入るように、それぞれの
一酸化炭素選択酸化手段の触媒温度に応じて各一酸化炭
素選択酸化手段への供給空気量を調整することを特徴と
する請求項１から請求項４のいずれか一つに記載の一酸
化炭素除去装置。6. A means for detecting the carbon monoxide concentration in the reformed gas discharged from the carbon monoxide selective oxidation means located at the most downstream side is provided, and the air amount adjusting means is included in the detected reformed gas. When the carbon monoxide concentration in the reformed gas does not fall within the predetermined concentration range, the carbon monoxide concentration in the reformed gas falls within the predetermined concentration range according to the catalyst temperature of each carbon monoxide selective oxidation means. 5. The carbon monoxide removing device according to claim 1, wherein the amount of air supplied to the selective oxidizing means is adjusted. 【請求項７】最上流に位置する一酸化炭素選択酸化手段
に流入する改質ガスの流量を検出する手段を設け、 前記空気量調整手段は、検出された改質ガスの流量が変
化したときに、一酸化炭素選択酸化手段に流入する空気
量をそれぞれの一酸化炭素選択酸化手段の触媒温度に応
じて調整することを特徴とする請求項１から請求項４の
いずれか一つに記載の一酸化炭素除去装置。7. A means for detecting the flow rate of the reformed gas flowing into the carbon monoxide selective oxidation means located at the uppermost stream is provided, and the air amount adjusting means is provided when the detected reformed gas flow rate changes. 5. The method according to claim 1, wherein the amount of air flowing into the carbon monoxide selective oxidation means is adjusted according to the catalyst temperature of each carbon monoxide selective oxidation means. Carbon monoxide remover.
JP2002088058A 2002-03-27 2002-03-27 Carbon monoxide removal equipment Expired - Fee Related JP3722079B2 (en)

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EP03002918A EP1369382A3 (en) 2002-03-27 2003-02-10 Carbon monoxide removal from reformate gas
US10/367,755 US7189373B2 (en) 2002-03-27 2003-02-19 Carbon monoxide removal from reformate gas

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Publication number Priority date Publication date Assignee Title
JP2007302533A (en) * 2006-05-12 2007-11-22 Mitsubishi Heavy Ind Ltd Fuel reforming apparatus, fuel cell system, and method for removing co
JP2012014960A (en) * 2010-06-30 2012-01-19 Mitsubishi Heavy Ind Ltd Co removal system and method for co removal

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JP3722079B2 (en) 2005-11-30
EP1369382A3 (en) 2005-12-21
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US7189373B2 (en) 2007-03-13

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